...
Key terms
REGEXP Rule - A regular expression that identifies all the SIP Response Codes returned from the Customer’s network device that will cause the Orchestrator to route advance to the next active Trunk trunk in the Trunk Group based on the configured Hunt Scheme. When there are no more active Trunks trunks available, a SIP XXX will be send towards is sent toward the inbound call leg (i.e. the Origination Vendor Trunk Group).
Common regular expressions - A The URL to of a website where you can build and test regular expressions.
...